diff --git a/app/service/agent/implementations/customer_service.py b/app/service/agent/implementations/customer_service.py
index ba717bb..4bcb605 100644
--- a/app/service/agent/implementations/customer_service.py
+++ b/app/service/agent/implementations/customer_service.py
@@ -262,7 +262,11 @@ class CustomerServiceAgent(BaseAgent):
         first = next((line.strip() for line in answer.splitlines() if line.strip()), "")
         first = first.lstrip("#").strip()
         topic = first.split("：", 1)[0].strip() if "：" in first else first
-        if not topic or len(topic) > 20 or "，" in topic or "。" in topic:
+        # FAQ 型回答的首行是"问：C1 客户能买什么产品?"，冒号前只有一个"问"字；
+        # 拿它当主语只会把检索词污染成"问 那它风险高吗"。
+        if not topic or topic in {"问", "答"}:
+            return ""
+        if len(topic) > 20 or "，" in topic or "。" in topic:
             return ""
         return topic
 
diff --git a/tests/unit/service/test_customer_service_search_query.py b/tests/unit/service/test_customer_service_search_query.py
index cf63daf..745ec71 100644
--- a/tests/unit/service/test_customer_service_search_query.py
+++ b/tests/unit/service/test_customer_service_search_query.py
@@ -51,6 +51,13 @@ def test_fallback_answer_yields_no_topic() -> None:
     assert CustomerServiceAgent._topic_of("") == ""
 
 
+def test_faq_style_answer_yields_no_topic() -> None:
+    """FAQ 型回答首行是"问：…"，冒号前只有一个"问"字，不能当主语。"""
+    assert CustomerServiceAgent._topic_of(
+        "问：C1 客户能买什么产品?\n答：C1（保守型）客户可以购买 R1、R2 等级的产品。"
+    ) == ""
+
+
 def test_topic_change_does_not_drag_previous_question_in() -> None:
     """客户换话题时，检索词里不能出现上一轮的痕迹（实测的答非所问场景）。"""
     query = CustomerServiceAgent._search_query(_request("基金赎回几天到账", PREVIOUS, ANSWER))